I have used units by Tasco, Simmons, and Bushnell. The Tasco and Simmons were models that were out years and years ago, when lasers first came out. They were both junk, so if you see some used ones for a cheap price, don't fall for them.
All of the Bushnell's I've used were great. I've used the Lytespeed 400 (Bushnell's first one), Yardage Pro Sport, Yardage Pro 600 and the Yardage Pro 800. The only one that belongs to me is the 800 yd model. No problems with any of them, regardless of the weather, but they are not waterproof, only weather resistant. I've gotten readings out to 1100 yds with the 800 model if the object is big enough, or highly reflective. Also, the max range is based on a highly reflective object. The 800 will only read out to 450 yds off a deer or elk, which is fine with me. When I use it, I don't range animals anyway, rather I range different landmarks or notables that I can write down/make a diagram with. When an animal comes out, I usually have the yardages memorized for objects nearby. The biggest problem I've found is getting steady enough to get readings at long range. I use my shooting sticks to help me steady the unit.
Before I got one, I didn't think I needed one that bad. Now that I have it, you'll never get it away from me. Using it has helped with my range estimates too. I've found that I can judge distance more accurately since I've been using one.
I'm very happy with my Yardage Pro 800. I just wish it was waterproof, as I go out in all weather. For that reason, I will eventually upgrade to the waterproof models available, or break down and get the Quest Rangefinder Binocular.